APA (7th ed.) Citation
Codd, E. (1990). The Relational Model for Database Management: Version 2. Addison-Wesley Publishing Company.
Chicago Style (17th ed.) Citation
Codd, E.F. The Relational Model for Database Management: Version 2. New York: Addison-Wesley Publishing Company, 1990.
MLA (9th ed.) Citation
Codd, E.F. The Relational Model for Database Management: Version 2. Addison-Wesley Publishing Company, 1990.
Warning: These citations may not always be 100% accurate.